I have seen, on a daily basis, the things a modern web developer has to do, because I am one!

HTML really isn't a programming language. There's a lot of client-side programming involved in a lot of modern websites, but that's not HTML, by definition. It's DHTML, which is covered in their list under JavaScript.
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“Every bit of code is either naturally related to the problem at hand, or else it's an accidental side effect of the fact that you happened to solve the problem using a digital computer.”
M-J D